[turbofan] Introduce Float64Pow and NumberPow operators.

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index 89eff90d12665acdc2384b8600aa5756bc68714e..824721d1e35dd359dbfe66e5b270c78cb44e339a 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -757,11 +757,8 @@ void StoreBufferOverflowStub::Generate(MacroAssembler* masm) {
 
 
 void MathPowStub::Generate(MacroAssembler* masm) {
-  const Register base = a1;
   const Register exponent = MathPowTaggedDescriptor::exponent();
   DCHECK(exponent.is(a2));
-  const Register heapnumbermap = a5;
-  const Register heapnumber = v0;
   const DoubleRegister double_base = f2;
   const DoubleRegister double_exponent = f4;
   const DoubleRegister double_result = f0;
@@ -771,35 +768,7 @@ void MathPowStub::Generate(MacroAssembler* masm) {
   const Register scratch2 = a7;
 
   Label call_runtime, done, int_exponent;
-  if (exponent_type() == ON_STACK) {
-    Label base_is_smi, unpack_exponent;
-    // The exponent and base are supplied as arguments on the stack.
-    // This can only happen if the stub is called from non-optimized code.
-    // Load input parameters from stack to double registers.
-    __ ld(base, MemOperand(sp, 1 * kPointerSize));
-    __ ld(exponent, MemOperand(sp, 0 * kPointerSize));
-
-    __ LoadRoot(heapnumbermap, Heap::kHeapNumberMapRootIndex);
-
-    __ UntagAndJumpIfSmi(scratch, base, &base_is_smi);
-    __ ld(scratch, FieldMemOperand(base, JSObject::kMapOffset));
-    __ Branch(&call_runtime, ne, scratch, Operand(heapnumbermap));
-
-    __ ldc1(double_base, FieldMemOperand(base, HeapNumber::kValueOffset));
-    __ jmp(&unpack_exponent);
-
-    __ bind(&base_is_smi);
-    __ mtc1(scratch, single_scratch);
-    __ cvt_d_w(double_base, single_scratch);
-    __ bind(&unpack_exponent);
-
-    __ UntagAndJumpIfSmi(scratch, exponent, &int_exponent);
-
-    __ ld(scratch, FieldMemOperand(exponent, JSObject::kMapOffset));
-    __ Branch(&call_runtime, ne, scratch, Operand(heapnumbermap));
-    __ ldc1(double_exponent,
-            FieldMemOperand(exponent, HeapNumber::kValueOffset));
-  } else if (exponent_type() == TAGGED) {
+  if (exponent_type() == TAGGED) {
     // Base is already in double_base.
     __ UntagAndJumpIfSmi(scratch, exponent, &int_exponent);
 
@@ -820,55 +789,6 @@ void MathPowStub::Generate(MacroAssembler* masm) {
     // scratch2 == 0 means there was no conversion error.
     __ Branch(&int_exponent_convert, eq, scratch2, Operand(zero_reg));
 
-    if (exponent_type() == ON_STACK) {
-      // Detect square root case.  Crankshaft detects constant +/-0.5 at
-      // compile time and uses DoMathPowHalf instead.  We then skip this check
-      // for non-constant cases of +/-0.5 as these hardly occur.
-      Label not_plus_half;
-
-      // Test for 0.5.
-      __ Move(double_scratch, 0.5);
-      __ BranchF(USE_DELAY_SLOT,
-                 &not_plus_half,
-                 NULL,
-                 ne,
-                 double_exponent,
-                 double_scratch);
-      // double_scratch can be overwritten in the delay slot.
-      // Calculates square root of base.  Check for the special case of
-      // Math.pow(-Infinity, 0.5) == Infinity (ECMA spec, 15.8.2.13).
-      __ Move(double_scratch, static_cast<double>(-V8_INFINITY));
-      __ BranchF(USE_DELAY_SLOT, &done, NULL, eq, double_base, double_scratch);
-      __ neg_d(double_result, double_scratch);
-
-      // Add +0 to convert -0 to +0.
-      __ add_d(double_scratch, double_base, kDoubleRegZero);
-      __ sqrt_d(double_result, double_scratch);
-      __ jmp(&done);
-
-      __ bind(&not_plus_half);
-      __ Move(double_scratch, -0.5);
-      __ BranchF(USE_DELAY_SLOT,
-                 &call_runtime,
-                 NULL,
-                 ne,
-                 double_exponent,
-                 double_scratch);
-      // double_scratch can be overwritten in the delay slot.
-      // Calculates square root of base.  Check for the special case of
-      // Math.pow(-Infinity, -0.5) == 0 (ECMA spec, 15.8.2.13).
-      __ Move(double_scratch, static_cast<double>(-V8_INFINITY));
-      __ BranchF(USE_DELAY_SLOT, &done, NULL, eq, double_base, double_scratch);
-      __ Move(double_result, kDoubleRegZero);
-
-      // Add +0 to convert -0 to +0.
-      __ add_d(double_scratch, double_base, kDoubleRegZero);
-      __ Move(double_result, 1.);
-      __ sqrt_d(double_scratch, double_scratch);
-      __ div_d(double_result, double_result, double_scratch);
-      __ jmp(&done);
-    }
-
     __ push(ra);
     {
       AllowExternalCallThatCantCauseGC scope(masm);
@@ -936,38 +856,20 @@ void MathPowStub::Generate(MacroAssembler* masm) {
   __ cvt_d_w(double_exponent, single_scratch);
 
   // Returning or bailing out.
-  if (exponent_type() == ON_STACK) {
-    // The arguments are still on the stack.
-    __ bind(&call_runtime);
-    __ TailCallRuntime(Runtime::kMathPowRT);
-
-    // The stub is called from non-optimized code, which expects the result
-    // as heap number in exponent.
-    __ bind(&done);
-    __ AllocateHeapNumber(
-        heapnumber, scratch, scratch2, heapnumbermap, &call_runtime);
-    __ sdc1(double_result,
-            FieldMemOperand(heapnumber, HeapNumber::kValueOffset));
-    DCHECK(heapnumber.is(v0));
-    __ DropAndRet(2);
-  } else {
-    __ push(ra);
-    {
-      AllowExternalCallThatCantCauseGC scope(masm);
-      __ PrepareCallCFunction(0, 2, scratch);
-      __ MovToFloatParameters(double_base, double_exponent);
-      __ CallCFunction(
-          ExternalReference::power_double_double_function(isolate()),
-          0, 2);
-    }
-    __ pop(ra);
-    __ MovFromFloatResult(double_result);
-
-    __ bind(&done);
-    __ Ret();
+  __ push(ra);
+  {
+    AllowExternalCallThatCantCauseGC scope(masm);
+    __ PrepareCallCFunction(0, 2, scratch);
+    __ MovToFloatParameters(double_base, double_exponent);
+    __ CallCFunction(ExternalReference::power_double_double_function(isolate()),
+                     0, 2);
   }
-}
+  __ pop(ra);
+  __ MovFromFloatResult(double_result);
 
+  __ bind(&done);
+  __ Ret();
+}
 
 bool CEntryStub::NeedsImmovableCode() {
   return true;